Miner&#39;s drill.



S.T.SKEENp MINERS DRILL.

APPLICATION FILED APR. 24,1914- Patented May 18, 1915 I I I v a -L@; I Invanbor: A- MQ 15mm full, clear,

UNITED STATES PATENTOFFIGE SAMUEL T. 'SKEEN, or sANnovhL', ILLINOIS.

MINERS DRILL.

To all whom it may concern:

Be it known that I, SAMUEL-T. a citizen of the United States cit-America,

-a resident of Sandovalyinv the county of Marion and State of Illinois, have invented certain new and useful Improvements in Miners Drills, of which the following is a and exact description, reference being had to the accompanying drawings, forming apart of .this specification.

My invention relates to' a drill, particularly adapted for use in drilling deposits, the present invention being'an improvement on the miners drill shown in Patent No. 1,065,005, issued to me June 17, 1913.

One of the objects of the present invention is to produce avery strong drill structure adapted to withstand the severe stresses to which a miners drillis subjected in drillinginto sulfur and other hard material found in coal deposits.

Theinventionfalso includes certain very desirable details of construction which will be hereinafter described- Figure I is a side elevation of a portion of a drill embodying the features of my invention- Fig. II is a side elevation partly in section showing the blades extended and locked in position. F ig..III is a longitudinal section taken approximately on1 line IIIIII, Fig. II. Fig. IV is a transverse section taken on the line IVIV, Fig. I. Fig. V is a perspective view of one of the blades. Fig. VI is a perspective view of a thrust block adapted to engage the blades.

In the accompanying drawingsyA designates a drill stem in the form of a spiral conveyer or worm having a thrust rod 1 at its inner end..- The thrust rod is arranged within and slidably' fitted to a blade holder B.

C designates blades pivotally' connected to the blade holder by a pivot pin 2 screwed into the blade holder as seen in Fig. III.

3 designates a thrust block arranged be- I tweenthe thrust rod 1 and the blades C,

said thrust block being arranged 'within and loosely fitted to the blade holder 13..

The blade holder is provided with substantially T-shaped slots D for the reception of i projections 4 carried by the thrust rod '1.

.These projections are preferably formed by f a pin which extends through the thrust rod.

Before using my drill a small hole may'be drilled into a coal deposit by a drill of any SKEEN,

ing the first part of the tion being due partly to into coal suitable construction and my drill is the blades are gradually Specification of Letters Patent. Patented May 18', 1915. i Application filed April 24; 1914. Sria1No.834,035i I y then inserted into the hole with its pivoted blades mechanism. Durdrilling operation j extended, this ac the shape of the blades andpartly to the pressure exerted on the blades by the transverse thrust block 3.; Fig. I shows the parts in the position they occupy at the beginning of the drilling operation audit will be noted that the pro ection 4: carried by the thrustrod 1 is so located in the slot D that the thrust rod" is free 'to slide independently of the blade holder B. The

thrust rod l'engages the thrust block 3'and the latter engages the a.

blades-C. When the drill is advanced and rotated each projection l rides along a wall 5 of the slot D, this wall being parallel with the axis of the drill and the projection, 4 being provided -Which is also parallel with. the axis ofthe with, the bearing face 6 drill. When the the ends of rod is turned independently of the blade holder and the projections 4 enter pockets 7 formed by the slot D. The parts then occupy the position seen in Fig. II and the projections 4' are interlocked with the blade holder to prevent the thrust members '1. and

projections 4 pass over the straight walls '5 the thrust holder, and the blades are thus securely I lockedin their extended positions. It is'important .to note that the projections 4; ride along the straight .walls 5 and that these projections cannot'lock the blades untilthey are alined with the pockets 7. At this time ride while the blades are moving to their ex-1 These cam walls cooper-- tended positions. ating with the projections tend to extend the blades at the beginning of the drilling operation, and I have found that this action places the projections under a very severe bending stress, the pins being very frequently bent in ruling along such 'cam'walls'. The outward movement ofthe blades is re sisted by the hard material in thecoal de:

90 3. from moving independently. ofthe blade posits and if the blades are positivelyv extended by means of a cam, some part of the drill is necessarily strained in overcom- I cam-like action when the'prnjections 4 enter During this return irregularities .or nicks in 1 fstr' bending"? the. blades: or injuring, some other 1 l'part of the drill.

the pockets 7 these projections are provided with straight faces which remain in contact with the straight walls 5 until the blades are fully extended.

When the drilling operation is completed the drill is reversely rotated and gradually withdrawn fromfthe inner'end ofthe hole. At this time the projections 4 enter pockets 8 in the blade holder and the blades are "thus locked in their extended positions.- movement of the drill the. cutting edges rotate in the same path they followed in forming the hole, and any the cutting edges of the blades will move freely over the corresponding projections formed in the hard material by said blades during the drilling operation. The ob ect. in locking the blades in withdrawing hole, .'is topositively hold the blades in posrtions where, they the-drill from the end of the will clear any: projectin hard material instead 0 Portions offithe' with the result of such material After theblades are released from the material at the end of the 1 the projections 4 is to locking sharpened.

hole, the conveyer stem A is turned slightly to release theprojections 8, thereby unlocking the blades and permitting them to swing drill is then withdrawn from the hole. Another object in forming pockets 8 to receive provide, means for he blades while they are being Each blade has a beveled cutting edge blades are secured to the blade holder. is of course quite important that the blades be securely held in position during thesharpening process and the pockets 8' are positioned to receive the projections 4 while the beveled edges 9 are being filed. The pressure of the file tends to. turn the blades and blade holder and the movement of the latter gagethe thrust block 3 and holder.B at

' drill.

which engage the projections '4.

Each blade C is formed with a pair of separated bearing faces 10 adaptedto enpoints on opposite sides of the axisof the These widely separated bearing'faces are so located with'respect to the axis of the, blades that the pivoted blades are very securelyheld in the positions seen in Fig. II when the thrust block is 'held against the material from collecting blades. To prevent between the bearing faces of the blades and extended positions extended positions and adapted to 4 from the pockets;

toward each other. The.

9 which may be filed while the, It

. the blade holder, the blade the thrust block where it would interfere with the proper locking of the blades by the projections 4, 1 form recesses 11 in the inner faces of the blades. The end of the thrust rod is provided with a recess 12 for thereception of material lying between the thrust block and the end of the thrust rod. To prevent the blades 0 from swinging to their while the drill isjbeing inserted into a hole, at least one of the blades is preferably bent or oflset as shown at 14, to frictionally engage the blade holder, thereby forcing both blades into frictional engagement with the blade holder when the parts occupy the positions shown in Fig. I.

I claim: I

1. A miners drill comprising a stem,-a thrust member at an end of said stem, a blade 'holder slidably fitted to said thrust member, blades pivoted to said blade holder and adapted to be extended in response to a movement of the drill, said blade holder being provided with a slot having a wallwhich lies substantially parallelwith'the axis of the blade holder and a pocket at the end of said wall, and a projection carried by-the thrust member adapted to ride along said wallwhen the blades are moving to their enter said pocket to lock the blades in their extended positions.

2. A miners drill comprising a blade holder, blades pivoted to said blade holder, a thrust member slidably fitted to said blade holder and adapted to turn independently of the blade holder, the blade holder being provided with a slot having a wall which lies substantially parallel with theaxis of said thrust member and also provided pocket at an end of said wall, and a projec tion carried by the thrust member adapted to ride along said wall when the thrust member slides in said blade holderand adapted to enter said pocketto lock the blades when the thrust member turns independently of said blade holder.-

3. A miners drill comprising a blade holder, blades pivoted to said blade holder, a thrust member slidably fitted to said blade holder and adapted to turn independently of holderlbeing provided with a slot having a Wall which lies substantially parallel w th the axis of said thrust member and also provided with a pocket at an end of said wall, and a projection having a flat bearing face adapted to ride along said wall when slides in said blade holder and adapted to enter said pocketto lockthe pivoted blades when the projection reaches the end of said wall.

the thrust member 7 4. A miners drill comprising a stem, a .thrust member at an end of said stem, a

and adapted to be extended in response to a movement of the drill, saidthrust member being movable independently of the blade holder while the blades are moving to their and a locking pin for extended positions,

member to secure the locking said thrust blades in their extended positions, said lockadapted to ride along'said ,wall and adapted mg pin being carried by the thrust member, and the blade holder being provided with a pair of pockets'one of which is adapted to receive said locking pin during the operation of the drill, the other pocket being adapted to receive the locln'ng pin when the blade holder is turned to sharpen the blades, substantially as described. t

5. A miners drill comprising a' stem, a thrust member at an end of said stem, a

' blade holder. slidably fitted to said thrustmember, blades pivoted to said blade holder and adapted to be extended in response to a movement of the drill, said blade holder being provided with a substantially T shaped slot forming a pair of pockets and having lel to the axis of saidthrust member, and a projection carried by said thrust memberaga'nst said blades tohold the latter in exten ed positions, and a thrust rod slidably fitted to said blade holder and thrust block.

holder, blades pivoted to said blade holder, a transverse thrust block loosely fitted to i said blade holder and adapted to bear against said blades to hold the latter in extended positions, and a thrust rod slidably fitted to said blade'holder and thrust block, said thrust rod being provided witha recess for the reception of material lying between a wall which lies substantially paral- A miners 'drill comprisingv a blade said ,thrust block and the end of the thrust rod.

' 8. A miners drill comprising a blade holder, blades pivoted to said blade holder, a thrust rodslidably fitted to the said blade holder, and a thrust block loosely mounted in saidblade holder, arranged between the blades and the thrust rod, and the blade being provided with bearmg faces adapted toengage said thrust block. I Y

9. A miners drill provided with a blade holder, blades pivoted to said blade holder, and a thrust member adapted to engage said blades to lock them in extended positions,

the thrust member and blades being so formed that the points of contact between said parts are separated from eachother and located at opposite sides of the axis of the drill.

10. A miners drill provided with a blade holder, blades pivoted to said blade holder, and at rust member adapted to lock said blades in extended positions, each of'said mg faces adapted member. s A

11; A miners drill comprising a'stem, a thrust member at an endflof'said stem, a

to engage said thrust.

'. blade holding memberslidably fittedto said thrust member, blades pivoted to said blade holding member and adapted to be extended 1n response to a movement ofthe drill, one .of said members being provided with a slot having a wallwhich lies substantially parallelwith the axis of the last mentioned memher and a pocket at the end of saidwall, and the other member havinga projection adapted to ride along said wall when the blades are movingto. their extended positions ';and adapted to enter said pocket to blades in their extended positions SAMUEL 'nsKEEN, j i

.In the presence ofv JOHN.G. BEILAMY, V A. L. Lnwrs.

said thrust block being I I V blades being provided with separated bearlock the 

